Senior Software Engineer (Python)

Aveni is redefining how financial institutions use AI. We build real, production-ready agentic systems that reshape how banks, advisers and financial services firms operate, replacing fragmented processes with intelligent, end-to-end workflows.

We have been recognised as Fintech of the Year for two consecutive years and awarded Best Specialist Technology Service at the Professional Adviser Awards 2025. Backed by leading investors including Puma Private Equity, and commercially supported by Lloyds Banking Group and Nationwide Building Society, we previously completed one of Scotland’s largest Series A rounds. Since then, we’ve continued to grow rapidly as adoption of AI in financial services accelerates, and we’re now scaling our engineering organisation to meet that demand.

Our engineering team includes experienced software engineers and PhD-level AI specialists, with strong ties to the University of Edinburgh, giving you access to exceptional expertise and opportunities for continuous learning as part of the day-to-day work.

The Role

Aveni is building next-generation AI systems for UK financial services, where safety, compliance, and trust are non-negotiable. We're hiring a Senior Software Engineer to work on AI and agentic platform capabilities that power intelligent, automated workflows for financial services. This is a high-impact role building foundational technology that underpins Aveni's AI-first strategy.

Your work will focus on:

You'll work on systems that govern how AI agents behave in regulated financial contexts, designing and implementing policy enforcement, safety controls, behavioural monitoring, and evaluation frameworks. This work sits at the intersection of platform engineering, AI/ML systems, and compliance-by-design architecture. You'll be joining at a pivotal moment as Aveni scales from startup to enterprise-grade AI FinTech, working on problems that matter: making AI safe, auditable, and trustworthy in high-stakes financial environments.

What You’ll Be Doing

Build Production-Grade Systems

Design and implement scalable Python services powering AI-driven workflows

Develop resilient, observable systems with strong error handling and compliance traceability

Work within a serverless, event-driven AWS architecture

Own Delivery End-to-End

Take ownership of features from design through to production

Collaborate with Product, AI Platform, and Compliance teams

Contribute to sprint planning, estimation, and delivery

Shape AI & Agentic Systems

Build intelligent workflows using LLMs and agentic architectures

Integrate AI models into production systems

Design guardrails, policy enforcement, and behavioural monitoring for AI agents

Mentor & Elevate the Team

Support and guide junior and mid-level engineers

Lead code reviews and promote engineering best practices

Contribute to documentation, demos, and knowledge sharing

Drive AI-Augmented Engineering

Use AI coding tools to accelerate development and improve quality

Help define best practices for AI-assisted software engineering

What We’re Looking For

Must Have

Strong Python expertise in production environments

Experience building cloud-native systems on AWS (Lambda, DynamoDB, S3, EventBridge)

Experience working with LLMs or AI/ML systems

Strong understanding of APIs, async systems, and scalable architecture

Nice to Have

Experience with AI safety, guardrails, or policy enforcement

Background in agentic systems or autonomous workflows

Experience in financial services or regulated environments

Familiarity with Node.js / TypeScript, Terraform or CDK

Knowledge of observability tools and ML fundamentals

You’ll Thrive If You Are

Pragmatic and able to balance speed with long-term quality

Curious about AI, especially safety and responsible usage

Comfortable working in a fast-moving scale-up environment

A strong communicator who can explain complex ideas clearly

Passionate about mentoring and raising team standards

Career Growth

This role offers a clear path into Staff or Lead Engineer positions, where you’ll:

Drive architectural decisions across multiple teams

Own complex, cross-cutting AI systems

Shape Aveni’s long-term AI platform strategy

Join Us in Making a Difference

At Aveni, we believe that diversity drives innovation. We’ve built our business to ensure an inclusive workplace where everyone feels valued and empowered to contribute their best work. If you’re passionate about technology and its ability to drive positive change for the future of financial services, we’d love to hear from you. Even if you don’t meet 100% of requirements, we’d like to hear from you anyway if you believe you’d fit in. Apply now to join us on our mission to transform the financial services industry through AI.

Benefits at Aveni. What you’ll love:

Remote-first working across the UK

Work abroad policy

Co-working spaces available

34 days holiday (including flexible bank holidays) and your birthday off

Company-wide off-sites

Optional Personal Development Plan

Flexible benefits platform

Protection essentials including Life Insurance, Income Protection, Critical Illness cover, and Pension (up to 5% matched employer contribution with optional increased contributions)

Private health and dental care

Potential share options

Enhanced family leave

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